Ferdinand proksch



F. PROKSCH.

TESTING LAMP. APPLICATION FILED MAR. 2a, I9I6. IIENEwED IuL'Y 9,1919.

1 3 1 3, 952 Patented Aug. 26, 1919.

fzgl 2 562 @ya FERDINAND PBOKSCH, 0F VIENNA, AUSTRIA.

TESTING-LAMP.

Specification of Letters Patent.

Patented Aug. 2c, 1919.

Application led March 28, 1916, Serial No. 87,279. Renewed July 9, 1919. Serial No. 309.779.

To all whom t may concern:

Be it known that I` FERDINAND Inonson, engineer` a subjectl of the Emperor of Austria. residing at Vienna, Austria, have invented certain new and useful Improvements in Testing-Lamps, of which the following is a specification.

Testing lamps as heretofore constructed have the disadvantage, among others, of being awkward in shape, which causes these lamps to be easily damaged when handled. The object of the present invention is to avoid the disadvantages of these known lamps and to provide a convenient form of testing lamp which may be easily carried about and which will be protected against damage. In order to obtain these advantages, according to this invention the carrier or socket of the lamp or lamps, consisting of insulating material, is made ilat and provided with a detachable protecting cap or screen through which the lamps are visible. The socket furthermore carries the fuse plug which closes the circuit. A special switch may also be provided on the socket. To attach the cap or screen to the socket a simple elastic clamp or the like 1s provided which enables the cap to be easily detached while the lamps are readily accessible. The whole arrangement is provided with an elastic clamp hook or the like by means of which the testing lamp may be suspended. My invention is not limited to the precise features shown in the drawings and may oe embodied in various forms. Besides the simple construction with only one lamp the same invention may also be carried lout with two or more lamps. In the latter case, the current may be so conducted as to obtain di'erent combinations so that the current flows through one, two or more lamps which enables the testing lamp to be adapted to circuits of different voltages. The lamps are placed in circuit preferably by means of a separate switch which may be provided at the socket or by changing the fuse plugs which may be used if desired to carry the cable.

In the drawings two forms of my invention are shown partly in section. Figure 1 represents one form of the invention in elevation, Fig. 2 is a side elevation, Fig. 3 is a plan view, while Fig. 4 represents the second form in elevation.

As shown in Fig. 1 the three lamps 1, 2 and 3 are .detachably screwed .in the holes Vtension of 220 volts.

3, 4 and 5 which are provided in the flat socket 6 of insulatin material. The holes 3, Ji and 5 are provlded at their upper and lower ends with metallic bushes, those bushes numbered.7, 8 and 9 receiving the lamps 1, 2 and 3 and the bushes 10, 11, 12, receiving the fuse plugs 13, 14 and 15. The fuse plugs 13 and 15 carry the cables 16 and 17 to connect the apparatus to the circuit. The closure of the circuit in this case is effected by inserting theV fuse plugs so that the contacts 18, touch the contacts 19 of the lamps 1, 2 and 3. The circuit may be traced through the cable 16, the fuse plug 13, the lamp 1, through the bush 7 and the bridge 20, the lamp 2, the fuse plug 14, the bush 11, the bridge 21, the bush 9, the lamp 3 to the fuse plug 15 and from here to the cable 17. In this case all the three lamps 1, 2 and 3 are included in the circuit. If they lamps 1 and 2 are provided for a tension of 22() volts and the lamps 3 for a tension of 110 volts, the whole apparatus will be adapted for 55() volts. The fuse plugs may be changed so that the plug 15 is screwed in the middle hole and the plug 14 in the last hole. In this case the current will iiow only through the lamps 1 and 2 so that the apparatus is suitable for a tension of 440 volts. In case the plug 13 is screwed in the middle hole and the plug 14 in the Iirst hole, only the lamp 3 will be included in the circuit and the apparatus will thus be adapted for a tension of 110 volts. In this case the lamp 3 may also be exchanged with lamp 1 or 2, so that the apparatus will be adapted for a It may thus be seen that by changing the plugs or lamps the apparatus can be adapted in unlimited manner for various tensions without altering the construction.

As shown in Figs. 1 and 2 a cap 22 is provided on the socket 6 which has its sides perforated, so that the lamps 1, 2 and 3 can be seen without detaching the cap. In order to fasten the cap 22 to the socket 6 a U-shaped sprin 23 is guided in a slide 24 which is attac ed to the cap 22. The legs of the U-shaped spring 24 extend through holes 25 provided in the socket 6 and are turned outwardly at their lower ends as shown at 26. Near the socket 6 the legs of the spring are bent outwardly to form the parts 27 which extend through the holes 28 provided in the cap 2g, If the parts 27 are pressed inwardly the ends 26 approach each other, so that the legs of the spring 23 may be drawn out of the holes 25 and the cap 22 together with the spring 23 can be taken off the socket. A hook 29 is provided on the cap to fasten the apparatus to the users garment.

Fig. 4 shows a second form of the invention in which two of the lamps are replaced by resistances and a switch is provided in order to put in circuitl the'lamp alone or together with one or both resistances. As shown in Fig. 4 the lamp 3 is screwed into a metallic bush 31 carried by the fiat socket 6. On opposite sides of this lamp resistances 32 and 33 arescrewed in the bushes 34 and 35. The two cables 36 and 37 enter the socket 6 through the holes 38 and 39 and lead to the fuse plugs 40 and 41 which are in contact with the bushes 34 and 35. The bush 34 is in contact with the bush 31 through a bridge 42 and the contact of the bush 31 with the bush 35 through the bridge43. The bridge 42 is furthermore connected with the contact a and the contact of the bush 31 with the contact b and the contact of the bush 35 with the 'contact c of the switch. The latter is also connected with the shaft 44 of the switch-lever 45.

Having now described my invention what I claim as new is:

1. In a testing lamp, a socket of insulating material, bushes in said socket, lamps screwed into certain'of said bushes and fuse plugs insertible in other of said bushes in position to be brought into contact with the lamps in the socket.

2. In a testing lamp, a socket of' insulating material, bushes in` said Socket, lamps screwed into certain of said bushes, fuse plugs insertible in other of said bushes in position to be brought into contact with the that byinserting the fuse plugs in the openings as required one or more lamps will be included in the circuit.

5. A testing lamp comprising a socket of insulating material, current translating devices insertible in said socket, and a cap or screen detachably :mounted on the socket, said cap being provided with a U-shaped spring the legs of which extend through holes provided in the socket and being turned outwardly at their lower ends.

6. A testing lamp comprising a socket of insulating material, current translating devices insertible in said socket and a cap or screen detachably mounted on the socket, said cap being provided with a U-shaped spring the legs of Wh'ch are bent outwardly near the socket to orm extensions which pass through holes in the side Walls of the cap so that the legs of the spring can be drawn out of the holes in the socket when the extensions are pressed inwardly.

In testimony whereof I alix my signature in the presence of two witnesses.

FERDINAND PROKSCH. 

